Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf2aa1d8f6f862a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 15:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d6e0eed83d5604b57ef197c2702387b SHA-1: 931eb67e23b363fa30417f98491f606763887721 SHA-256: acf2aa1d8f6f862a66efbbbc7eebd61dd844e9e7169dfbb2db05a7e6253dfb95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to potentially malicious content, including compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gediklimakinahidrolik.com/resimler/files/sivorovuwefawa.pdf In PDF document text
    • https://laps.pl/userfiles/file/gesotote.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56ba733d1dd7e55fec10376117320bff/xexivifuxawavuzitisikubiw.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/kuzarubatozokisunaj.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/puxemotuj.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/36268154685.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913030928396566.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/fakojobedulaxebum.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ed993629c5b7d26894b1129a6d23c3e4/namasowatix.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/32345606674.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/54279322655.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613195fb4ec08---93753853062.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/5291163567.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/10550559261.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/99901510929.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/vifojoli.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/67034640068.pdfIn PDF document text
    • http://kunbot.com/upload/files/72429754418.pdfIn PDF document text
    • http://kvrhousing.com/uploads/divevagonivorowevuf.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/66750803132.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wutolekelomuguviwiveso.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/mutojuduxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mega+shows+latest+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 17936 bytes
SHA-256: 432c5b64ce35fa551dda702a561b5610f4d955f255557cd3f3f56ee9e2d753b4
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 10652 bytes
SHA-256: 71b2f9a5121da06b94c0bbfa7eb91149f08ea7bd0ee9e785c4629a9094bfe201